What is loopback Detection The Loopback Detection function is used to detect the loop created by a specific port while Spanning Tree Protocol (STP) is not enabled in the network, especially when the down link devices are hubs or unmanaged switches. The Switch will automatically shut down the port and sends a log to the administrator. The Loopback Detection port will be unlocked when the Loopback Detection Recover Time times out. The Loopback Detection function can be implemented on a range of ports at a time.

Step 1: Open an Internet browser (such as Internet Explorer) and enter http://10.90.90.90 (if the switch has the default IP address) in the address bar, then press Enter.

NOTE: If you have changed the IP address, plesae use the assigned IP address instead of the default.

Step 2: Enter the password for your Admin account in the field provided. If you have not changed this password from the default, the password is ”admin”. Click OK.

Step 3: Click L2 Functions then select Loopback Detection.

Step 4: Under Loopback Detection Settings

Enable Loopback detection.

Select the mode, specify Port-based or VLAN-based mode.

Set a Loop detection Interval between 1 and 32767 seconds. The default is 2 seconds. Click Apply to save your changes.

From Port: The beginning of a consecutive group of ports may be configured starting with the selected port.

To Port: The ending of a consecutive group of ports may be configured starting with the selected port.

State: Use the drop-down menu to toggle between Enabled and Disabled. The default is disabled. Click Apply to implement changes made or click Refresh to refresh the Loopback Detection table.

To prevent accidental removal of the AC power cord, it is recommended to install the power cord clip together with the power cord.

1. With the rough side facing down, insert the Tie Wrap into the hole below the power socket.
2. Plug the AC power cord into the power socket of the Switch.
3. Slide the retainer through the Tie Wrap until the end of the cord.
4. Circle the tie of the retainer around the power cord and into the locker of the retainer.
5. Fasten the tie of the retainer until the power cord is secured.

Mount on a Rack

The D-Link GO-SW-16GE can easily be mounted on a rack. Two mounting ears are provided for this purpose. Make sure that the front panel is exposed in order to view the LEDs.

1. Attach the ears to each side of the switch, using the screw-holes located on the side of the device.
2. Firmly attach the ears to the rack. Please follow the usual safety precautions for rack-mountable products.

Connecting the Switch

Step 1

Plug the supplied power cord into the Switch and the other end into a power outlet, power strip, or surge protector (recommended). Verify the Power indicator is lit on the Switch.

Step 2

Connect one end of an Ethernet cable in the device you want to connect to the Switch and the other end into one of the Ethernet ports on the Switch. Check the Link lights (LEDs) on both the Switch and the device to verify that the cable is good and that there is a valid connection.

Note: A Category 5 (or higher) Ethernet cable must be used for 100Mbps or higher operation.

This section will explain how to connect Ethernet devices to your new D-Link switch and how to mount the switch.

Before You Connect to the Network

The site where you install the switch may greatly affect its performance. Please follow these guidelines for setting up the switch.

• Install the switch on a sturdy, level surface that can support at least 3 kg (6.6 lbs.) of weight. Do not place heavy objects on the switch.

• The power outlet should be within 1.82 meters (6 feet) of the switch.

• Visually inspect the power cord and see that it is fully secured to the AC power port.

• Make sure that there is adequate space for proper heat dissipation from and adequate ventilation around the switch. Leave at least 10 cm (4 inches) of space at the front and rear of the switch for ventilation.

• Install the switch in a fairly cool and dry place for the acceptable temperature and humidity operating ranges.

• Install the switch in a site free from strong electromagnetic field generators (such as motors), vibration, dust, and direct exposure to sunlight.

• When installing the switch on a level surface, attach the rubber feet to the bottom of the device. The rubber feet cushion the switch, protect the casing from scratches, and prevent it from scratching other surfaces.

Mounting the switch on a Rack

The DGS-1016D/1024D can easily be mounted on a rack. Two mounting ears are provided for this purpose. Make sure that the front panel is exposed in order to view the LEDs. Please refer to the following illustrations:

1. Attach the ears to each side of the switch, using the screw-holes located on the side of the device.

2. Firmly attach the ears to the rack as shown. Please follow the usual safety precautions for rack-mountable products.

Attaching the Rubber Feet

Use rubber feet provided. Position and apply rubber feet to the underside of the DGS-1016D/1024D switch.

CAUTION: Do not place any device on top of switch, or place the switch on top of any device or object that will block the free flow of air through the ventilation slots on the sides, top, and bottom of the switch’s case. In addition, care should be taken not to locate the switch next to, on top of, or underneath any device that generates a significant amount of heat.

For the switch to perform at its optimal level, the switch must have adequate ventilation to prevent the switch from overheating and becoming damaged.

Power On

To power on the switch, Plug-in the female connector of the provided power cord into this socket, and the male side of the cord into a suitable power source.

After the Switch is powered on, the LED indicators will blink briefly while the system resets.

Power Failure

As a precaution, in the event of a power failure, unplug the switch. When power is resumed, plug the switch back in.

Cable Quality

NOTE: All Ethernet ports auto-detect MDI-II/MDI-X, port speed (10, 100, 1000Mbps) and duplex of the device connected to the switch.

• For connections to 10BASE-T and 100BASE-TX devices, use Category 5 or 5e UTP/STP cable.
• For connections to 1000BASE-T and 100BASE-TX devices, use Category 5e or better UTP/STP cable. All 1000BASE-T connections operate in full duplex mode.

NOTE: UTP (Unshielded Twisted Pair) Ethernet cabling is adequate for most small office environments. More expensive STP (Shielded Twisted Pair) can also be used, but is generally only needed where there will be risk of strong Electromagnetic of Radio Frequency Interference.

Connecting the Switch

DGS-1016D/1024D to End Node

End nodes include PCs outfitted with a 10, 100, or 1000 Mbps RJ-45 Ethernet Network Interface Card (NIC) and most routers. An end node can be connected to the switch via a twisted-pair Category 3, 4, 5, or 5e UTP/STP cable. The end node can be connected to any of the ports of the switch.

The Link/Act LEDs for each UTP port light green when the link is valid. The LED over the port label indicates a port speed of either 10/100 Mbps or 1000Mbps. A blinking LED on the bottom indicates packet activity on that port.

Hub/switch to DGS-1016D/1024D

These connections can be accomplished in a number of ways using a standard Ethernet cable.

• A 10BASE-T hub or switch can be connected to the switch via a twisted-pair Category 3, 4, 5, or 5e UTP/STP cable.
• A 100BASE-TX hub or switch can be connected to the switch via a twisted-pair Category 5/5e UTP/STP cable.
• A 1000BASE-T switch can be connected to the switch via a twisted -pair Category 5/5e or better UTP/STP cable.

The LED indicators of the switch include Power, 100/1000Mbps, and Link/Act. The following shows the LED indicators for the switch along with an explanation of each indicator.

LED Indicators:

Comprehensive LED indicators display the conditions of the switch and status of the network. A description of these LED indicators follows (see LED Indicators). The LED indicators of the switch include Power, Link/Act, 1000Mbps, and 100Mbps.

Power Indicator

This green indicator illuminates when the switch is receiving power.

Link/Act

This green indicator illuminates steadily when a port is connected to a station successfully and has a good link. The indicator will blink to indicate that a port is transmitting or receiving data on the network.

Speed − 1000Mbps/Green; 100Mbps/Amber; 10Mbps/Off

This indicator is amber-colored when the port is connected to a 100MbpsFast Ethernet station. It is green when the port is connected to a 1000Mbps Ethernet station. It is not illuminated when the port is connected to a 10Mbps Ethernet station.

Auto MDI/MDI-X Ports:

Gigabit Ethernet Auto-Negotiating ports (10/100/1000Mbps) Comprehensive LED indicators display the conditions of the switch and status of the network.

AC Power Jack:

The power cable connection is located on the rear panel of the switch.

Switch power input is provided by and internal universal power supply (100-240VAC : 50-60Hz, 0.4A Max: 12V/3.3A).
The AC power connector is a standard three-pronged connector that supports the power cord. Please see the Power On section below for instructions on how to properly connect the switch to a power source.

Step 1 Open a web browser and type the IP address of the switch in the address bar (default is 10.90.90.90). Press Enter.

Step 2 Both the default username and password are blank (nothing). Click OK.

Step 3 On the left side, click Configuration and then click Advanced Settings.

Step 4 Configure the following:

• Serial Port Auto Logout – This setting automatically logs out a user connected to the console port after a specified amount of time. Select 2 Minutes, 5 Minutes, 10 Minutes, 15 Minutes, or Never using the drop-down list. The default setting is 10 Minutes.

• Serial Port Baud Rate – This setting is locked down to 115220 and cannot be changed. Users connecting to the console interface of the switch must use this baud rate.

• MAC Address Aging Time (10-1000000) – This field specifies the length of time a learned MAC Address will remain in the forwarding table without being accessed (that is, how long a learned MAC Address is allowed to remain idle). The default age-out time for the switch is 300 seconds. To change this, type in a different value representing the MAC address age-out time in seconds. The MAC Address Aging Time can be set to any value between 10 and 1,000,000 seconds.

• IGMP Snooping – Select Enabled to enable this feature or Disabled to disable it using the drop-down list. Enabling IGMP snooping allows you to specify use of a multicast router only. IGMP Snooping for individual VLANs needs to be configured on the IGMP Snooping page in the IGMP folder.

• Multicast router Only – Select Enabled to support Multicast router only or Disabled to disable it using the drop-down list.

• Telnet Status – Select Enabled to enabled administration of the switch via Telnet or Disabled to disable it using the drop-down list. This feature is enabled by default.

• Telnet TCP Port Number (1-65535) – Enter the port number for administering the switch via Telnet. The default port is 23.

• Web Status – This indicates if web-based administration is enabled. Web-based administration is configured on the IP Address page in the Configuration folder. The standard port used for web-based administration is 80.

• RMON Status – Select Enabled to allow Remote Monitoring (RMON) of the switch or Disabled to disable it using the drop-down list.

• Link Aggregation Algorithm – This is the algorithm that the switch uses to balance the load across the ports that make up the port trunk group. Select MAC Source, MAC Destination, MAC Src & Dest, IP Source, IP Destination or IP Src & Dest using the drop-down list.

• Switch 802.1x – Select Enabled to enable 802.1x for MAC-based or Port-based 802.1x function or Disabled to disable it using the drop-down list. This feature is disabled by default. Port-based 802.1x function will base authentication only on the port number. MAC-based 802.1x function uses the port number and specified MAC address as configured in the 802.1x Initialize Ports menu.

• Auth. Protocol – Select Local Eap or Radius Eap using the drop-down list. The default setting is Radius Eap.

• HOL Prevention – Select Enabled to enable Head of Line (HOL) Protection or Disabled to disable it using the drop-down list.

• Jumbo Frame – Select Enabled to enable support for Jumbo Frames up to 9216 bytes or Disable to disable using the drop-down list.

• Syslog State – Select Enabled to enable Syslog State or Disabled to disable it using the drop-down list. The default setting is Disabled. With Syslog State enabled the switch can report activity to a Syslog server.